package com.bins.charts.protobuf;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;

public class Server {
    public static void main(String[] args) {
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            // 创建服务端的启动对象，配置参数
            ServerBootstrap bootstrap = new ServerBootstrap();
            // 对启动对象进行设置
            bootstrap.group(bossGroup, workerGroup) // 设置两个线程组
                    .channel(NioServerSocketChannel.class) // 使用NioServerSocketChannel作为服务器的通道实现
                    .option(ChannelOption.SO_BACKLOG, 128) // 设置线程队列等待连接个数
                    .childOption(ChannelOption.SO_KEEPALIVE, true) // 设置保持活动连接状态
                    .childHandler(new ChannelInitializer<SocketChannel>() { // 创建一个通道初始化对象（匿名对象）
                        // 给pipeline设置处理器
                        @Override
                        protected void initChannel(SocketChannel ch) {
                            ChannelPipeline pipeline = ch.pipeline();
                            // 在pipeline中加入ProtoBufDecoder，指定对哪种对象进行解码
//                            pipeline.addLast("decoder", new ProtobufDecoder(StudentPOJO.Student.getDefaultInstance()));
                            pipeline.addLast("decoder", new ProtobufDecoder(MyDataInfo.MyMessage.getDefaultInstance()));
                            pipeline.addLast(new SimpleServerHandler());
                        }
                    }); // 给workerGroup的EventLoop对应的管道设置处理器
            // 绑定一个端口并且同步，生成一个ChannelFuture对象。启动服务器，并绑定端口
            ChannelFuture cf = bootstrap.bind(6666).sync();
            // Future-Listener机制。添加listener可以在事件完成时判断事件是否成功、是否取消等操作
            cf.addListener((ChannelFutureListener) future -> {
                if (future.isSuccess()) {
                    System.out.println("监听端口6666成功");
                } else {
                    System.out.println("监听端口6666失败，原因：" + future.cause().getMessage());
                }
            });
            // 对关闭通道进行监听
            cf.channel().closeFuture().sync();
        } catch (InterruptedException e) {
           e.printStackTrace();
        } finally{
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}